5 ms·

Probably mostly that motors which are - small, - accurate, - fast, and - cheap do not exist.

• savrajsingh 16y ago
  RC servos meet all of those requirements, wouldn't you agree?
  • houseabsolute 16y ago
    Probably except accurate, although I should probably add the criterion "torqueful" since that robot looks heavy.
  • beambot 16y ago
    No, I would not. RC servos cannot follow specifically-defined trajectories, otherwise known as splines (ie. be at encoder position X at time Y), as RC servos rely on very basic (analog) position feedback. Some of the lowest-level PR2 controllers require the specification of splines to achieve accurate motion.
  • jff 16y ago
    Servos are pretty much terrible for anything except maybe driving the wheels on a very small robot, provided that robot is also equipped with encoders on the wheels. Basically you're just applying power to the motor for some time and hoping it turns the right amount; unlike say a stepper motor, you have no built-in guarantee of how far it'll turn. You can make up for that with the encoders, but the other big problem with servos is that they're not very strong... all the ones I've ever used have plastic gears inside which love to strip.